Practice question
Question
Which subshell begins filling after the 5s subshell in multi-electron atoms?
Explanation
The Aufbau order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, ldots. After 5s, the 4d subshell fills. This follows from NCERT principle where relation explains outcome clearly for students.
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